This is one of the first prototypes I featured on SNES Central. John Weidman, aka The Dumper, was well known for being able to dump SNES games that conventional copiers were unable to, such as SA-1 games. He sent me a few things back in the day (I think circa 2003), including pictures of a this rare SA-1 prototype of SD F1 Grand Prix. Here is some information he gave me:

These are scans of a SNES SA1 proto board I own. The game it is a proto for is SD F1 Grand Prix. I have seen many SNES prototypes for sale but I have only ever seen one SA1 proto for sale and this is it. I'd say this is very rare.

The SA1 chip has a CIC lockout chip built into it. I believe that by switching one of the DIP switches you will be able to change the CIC lockout from NTSC to PAL, but since I don't have a PAL SNES I can't test this theory.

You'll note that there is some rework on the SRAM chip. This is to adapt the pinout of a socket for a 1 Mbit SRAM to the pinout of the smaller 64 Kbit SRAM chip installed on the PCB.

A ROM image of the prototype made its way into ROM sets, and I assume that it is a dump of this cart by Weidman. However, I don't know this for certain. As far as I can tell, it doesn't differ that much from the final game. They have disabled the "time attack" mode in this sample. Deep delving into this game is a bit difficult at the moment, since the sample does not work in SNES9x.

Screen that pops up when you load the game

Here is what this screen says:

この カセットは はんばい そくしんよう です。

"This cassette is for sales promotion use."

この カセットを むだんで かいへん ふくせい することは ほうりつで きんし されています。

"Reproduction of this cassette without permission is prohibited by law."